Adjust config

config/services.yaml

@@ -5,8 +5,12 @@ services:
 
     pcm_icon.icon_extension:
         public: true
-        class: Pcm\IconBundle\Twig\Functions\IconExtension
+        class: Pcm\IconBundle\Twig\Extension\IconExtension
 
-    Pcm\IconBundle\Twig\Functions\IconExtension:
+    Pcm\IconBundle\Twig\Extension\IconExtension:
         public: false
         alias: pcm_icon.icon_extension
+
+    Pcm\IconBundle\Twig\Runtime\IconRuntime:
+        tags:
+            - { name: twig.runtime }